f(x)=3x ,g(x) = x2 find gof(x)
What motor is NOT suitable for use as a DC machine?
Squirrel cage motor
we can either use dc series motor or induction machine ,but dc supply is not easily available so we use induction motor ,
The slip rings are the most important brush in DC machine.
dual H- bridge use to drive DC motors
swinburne's test on dc shunt machine is to predetermine the efficiency of the dc machine , but it is not accurate it is just like estimation of efficiency of dc shunt machine when it is run as a motor and a generator............................
take care of the problem of induced AC field current due to armature reaction /Omara
it is a machine which operates on the dc power source.
05 types of dc machines
In a DC machine, the function of the yoke, or frame, is to provide structural support and house the magnetic components. It serves as a pathway for the magnetic flux generated by the field windings, ensuring efficient magnetic circuit continuity. Additionally, the yoke protects the internal components from environmental factors and mechanical damage. It is typically made of ferromagnetic material to enhance its magnetic properties.
equation of ac machine
to convert the DC into DC.............